movie themes seem to always be what's coming out. If they wanted to go retro, and go best bang for buck, here's the top 250 movies of all time:
http://www.imdb.com/chart/top
#4 - Pulp fiction
#10 - fight club
#18 - forrest gump
#19 - matrix
#40 - alien
#57 - aliens
Seems to me, an aliens trilogy or a Tarantino theme would go over well (Skit-b should just do aliens, would be a perfect compliment to predator)